Will fear reduce healthcare costs?

Several weeks ago, new guidelines came out calling for a reduced schedule for employing mammograms.  Many citizens groups condemned these decisions, even though it was supported by many doctors and medical groups.  

Today, it is being reported that giving a child a CT scan carries a 1/500 chance of them developing cancer, not a trivial number.  Mammograms carry much lower, but similar risks.  Additionally, 1/3 of CT's are characterized as "unnecessary" but many people are now so scared after the death of Natasha Richardson that they feel any bump on the head merits one.  Perhaps this will scare them the other way, and also reduce medical costs for everyone.